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Prior to this change, SPR-13867 made sure that any class extending WebContentGenerator would not overwrite existing HTTP "Cache-Control" response headers - set by a filter, a Controller handler, etc. This caused issues with resource handling, since specifying a cache configuration there would not overwrite default headers set by filters, for example by Spring Security. This commit restricts the previous changes to the RequestMappingHandlerAdapter, in order to avoid overwriting header set by a filter or a Controller handler in those cases. Issue: SPR-14005